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Proceedings Paper

Pentacene organic field-effect phototransistor with memory effect
Author(s): Maarten Debucquoy; Stijn Verlaak; Soeren Stoedel; Stijn De Vusser; Jan Genoe; Paul Heremans
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Paper Abstract

Now organic thin film transistor technology gains growing maturity, high performance organic photodetectors are the missing link towards full organic photosensitive sensor arrays, needed for the realization of applications like organic scanners and organic cameras. In the borderline of the research in organic solar cells, research in organic photodetectors has mainly been limited to organic photodiodes. However, phototransistors offer the possibility to reach higher sensitivities, thanks to the internal current gain of a transistor structure. This document focuses on organic field-effect phototransistors (organic photoFETs) where illumination can be used as an optical gate signal in addition to the electrical gate signal. An experimental description of pentacene photoFETs during broadband illumination is given. A distinction between the direct photocurrent and the additional current enhancement by a thresholdshift can be made, and a relation for this thresholdshift in function of time is revealed. Consequently, the diffculty to compare different organic photoFETs without any information about the illumination time is highlighted and a comparison based on this power law is proposed. Subsequently it is pointed out that by the stability of this thresholdshift after illumination, the pentacene photoFET does not only act as a light detector but also as a memory element, capable to store information about illumination power and duration for an extended amount of time.

Paper Details

Date Published: 20 April 2006
PDF: 10 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 61921F (20 April 2006); doi: 10.1117/12.667246
Show Author Affiliations
Maarten Debucquoy, IMEC, MCP/PME (Belgium)
Katholieke Univ. Leuven (Belgium)
Stijn Verlaak, IMEC, MCP/PME (Belgium)
Soeren Stoedel, IMEC, MCP/PME (Belgium)
Katholieke Univ. Leuven (Belgium)
Stijn De Vusser, IMEC, MCP/PME (Belgium)
Katholieke Univ. Leuven (Belgium)
Jan Genoe, IMEC, MCP/PME (Belgium)
Paul Heremans, IMEC, MCP/PME (Belgium)
Katholieke Univ. Leuven (Belgium)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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